From a breeding laboratory putting species on "life support" to the world's first fully electric smart tractor, scientists are working to halt the decline of California's butterflies.
San Diego Zoo races to save butterflies
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The zoo is racing to save some of San Diego s rarest butterflies before they vanish
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The zoo is racing to save some of San Diego s rarest butterflies before they vanish | Nation/World
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The zoo is racing to save some of San Diego s rarest butterflies before they vanish
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